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Am J Physiol Cell Physiol 276: C182-C192, 1999;
0363-6143/99 $5.00
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Vol. 276, Issue 1, C182-C192, January 1999

Association of intrinsic pICln with volume-activated Clminus current and volume regulation in a native epithelial cell

Lixin Chen, Liwei Wang, and Tim J. C. Jacob

School of Biosciences, Cardiff University, Cardiff CF1 3US, United Kingdom

We investigated the relationship between pICln, the volume-activated Cl- current, and volume regulation in native bovine nonpigmented ciliary epithelial (NPCE) cells. Immunofluorescence studies demonstrated the presence of pICln protein in the NPCE cells. Exposure to hypotonic solution activated a Cl- current and induced regulatory volume decrease (RVD) in freshly isolated bovine NPCE cells. Three antisense oligonucleotides complementary to human pICln mRNA were used in the experiments. The antisense oligonucleotides were taken up by the cells in a dose-dependent manner. The antisense oligonucleotides, designed to be complementary to the initiation codon region of the human pICln mRNA, "knocked down" the pICln protein immunofluorescence, delayed the activation of volume-activated Cl- current, diminished the value of the current, and reduced the ability of the cells to volume regulate. We conclude that pICln is involved in the activation pathway of the volume-activated Cl- current and RVD following hypotonic swelling.

antisense oligonucleotides; ciliary epithelium; secretion; fluid transport; ion channels; nonpigmented ciliary epithelial cells


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